You touch a willing creature who isn't wearing armor,and a protective magical force surrounds it until the spell ends. The target's base AC becomes 13 + its Dexterity modifier. The spell ends it if the target dons armor or if you dismiss the spell as an action.
An invisible barrier of magical force appears and protects you. Until the start of your next turn,you have a +5 bonus to AC,including against the triggering attack,and you take no damage from magic missile.